Compressor

Abstract

This compressor includes housing members that form a body; a drive shaft linked to a drive power source via an electromagnetic clutch; movable members moving in cooperation with the drive shaft and carrying out the compression of a fluid; a detected body moving in cooperation with the drive shaft; a drain bolt screwed into a drain bolt hole provided in a housing member in proximity to the detected body; and a detecting device detecting the rotation state of the drive shaft by the detected body. The drain bolt is provided with a permanent magnet, the detecting device is structured by a magnetic sensor that includes a magnetic impedance element, and the magnetic sensor is provided at the head portion of the drain bolt. Thereby, it is possible to provide a rotation detecting mechanism by using an existing drain bolt, without requiring the machining of a hole in the compressor body.

1 . A compressor, comprising:
 a plurality of housing members that form a body;   a drive shaft that is inserted into said body and that is linked to a drive power source via an electromagnetic clutch;   a movable member that moves in cooperation with said drive shaft and that carry out the compression of a fluid;   a detected body that moves in cooperation with said drive shaft;   a drain bolt that is screwed into a drain bolt hole provided in the housing member in proximity to said detected body; and   a detecting device that detects the rotation state of said drive shaft by said detected body; wherein:   said drain bolt is provided with a permanent magnet; and   said detecting device is structured by a magnetic sensor and said magnetic sensor is provided at the head portion of said drain bolt.   
   
   
       2 . The compressor according to  claim 1 , wherein a circulating magnetic circuit is formed by a magnetic flux from said permanent magnet being conducted through the detected body and the drain bolt. 
   
   
       3 . The compressor according to  claim 1 , wherein said permanent magnet is provided at the distal end of said drain bolt. 
   
   
       4 . The compressor according to  claim 1 , wherein said permanent magnet is provided at the head portion of said drain bolt. 
   
   
       5 . The compressor according to  claim 1 , wherein said detecting device is further provided with a magnetic member that covers the head portion of said drain bolt. 
   
   
       6 . The compressor according to  claim 2 , wherein said permanent magnet is provided at the distal end of said drain bolt. 
   
   
       7 . The compressor according to  claim 2 , wherein said permanent magnet is provided at the head portion of said drain bolt. 
   
   
       8 . The compressor according to  claim 2 , wherein said detecting device is further provided with a magnetic member that covers the head portion of said drain bolt. 
   
   
       9 . The compressor according to  claim 3 , wherein said detecting device is further provided with a magnetic member that covers the head portion of said drain bolt. 
   
   
       10 . The compressor according to  claim 4 , wherein said detecting device is further provided with a magnetic member that covers the head portion of said drain bolt. 
   
   
       11 . The compressor according to  claim 6 , wherein said detecting device is further provided with a magnetic member that covers the head portion of said drain bolt. 
   
   
       12 . The compressor according to  claim 7 , wherein said detecting device is further provided with a magnetic member that covers the head portion of said drain bolt. 
   
   
       13 . A compressor, comprising:
 a plurality of housing members that form a body;   a drive shaft that is inserted into said body and that is linked to a drive power source via an electromagnetic clutch;   a movable member that moves in cooperation with said drive shaft and that carry out the compression of a fluid;   a detected body that moves in cooperation with said drive shaft;   a drain bolt that is screwed into a drain bolt hole provided in the housing member in proximity to said detected body; and   a detecting device that detects the rotation state of said drive shaft by said detected body; wherein:   said detected body is provided with a permanent magnet on the circumferential edge portion thereof; and   said detecting device is structured by a magnetic sensor and said magnetic sensor is provided at the head portion of said drain bolt.   
   
   
       14 . The compressor according to  claim 13 , wherein a circulating magnetic circuit is formed by the magnetic flux from said permanent magnet being conducted through the detected body and the drain bolt. 
   
   
       15 . The compressor according to  claim 13 , wherein said detecting device is further provided with a magnetic member that covers the head portion of said drain bolt. 
   
   
       16 . The compressor according to  claim 14 , wherein said detecting device is further provided with a magnetic member that covers the head portion of said drain bolt.